ISO 22743:2006

Name: ISO 22743:2006 — Water quality — Determination of sulfates — Method by continuous flow analysis (CFA)
SKU: ISO 22743:2006
Price: 27000 RUB
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Water quality — Determination of sulfates — Method by continuous flow analysis (CFA)

Название (английский):

ISO 22743:2006

Water quality — Determination of sulfates — Method by continuous flow analysis (CFA)

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 15
Дата публикации:: 6 апреля 2006 г.
Издание:: ISO IS 22743 edition 1 version 1
ICS:: 13.060.50

Тип поставки:

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Язык документа:

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Срок поставки:3 раб. дн. (перевод)

Цена:27 000 ₽

Описание (английский):

ISO 22743:2006 specifies a continuous flow analysis (CFA) method for the determination of sulfate in various types of water (such as ground water, drinking water and waste water). The method is applicable to samples with a sulfate (SO4) mass concentration from 30 mg/l to 300 mg/l. Other concentration ranges are applicable, provided they cover exactly one decade of concentration units (e.g. 100 mg/l to 1 000 mg/l).

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 22743:2006 specifies a laboratory method for the determination of sulfates in water by continuous flow analysis (CFA). The standard covers procedures, reagents, apparatus and quality checks for measuring sulfate (SO4) mass concentrations typically from 30 mg/l to 300 mg/l (other ranges allowed provided they span exactly one decade). It is applicable to groundwater, drinking water and wastewater and is intended for routine, high‑throughput water quality testing.

Key Topics and Requirements

Principle: Sulfate is precipitated as barium sulfate in acidic solution; excess barium reacts with methylthymol blue and the absorbance of the non‑chelated dye is measured (nominal detection at 460 nm ± 10 nm).

Range & Calibration: Typical working range 30–300 mg/l SO4. Calibration requires at least five calibration solutions across the range; calibration and linearity evaluation follow ISO 8466‑1 (and ISO 8466‑2 for non‑linear fits).

Interferences: Calcium, magnesium, iron and aluminium cause negative bias - removed using a cation exchange column (e.g., DOWEX 50W‑X8). Sulfide, sulfite, phosphate and tannic acids can cause positive bias at high concentrations.

Reagents & Stability: Key reagents include barium chloride, methylthymol blue, buffered Na‑EDTA, NaOH and prepared sulfate standards. Examples of stability: barium chloride solution (stable ~1 month at 2–6 °C), methylthymol blue solution (stable ~1 week at 2–6 °C).

Apparatus: Typical CFA system components - sampler, reagent containers, low‑pulse pump, inlet connector, photometer with flow cell (e.g., 10 mm path length), data acquisition.

Performance Checks: System must produce ≥0.260 absorbance/cm for ~100 mg/l standard; 30 mg/l standard must yield signal‑to‑noise ≥3:1. Daily sensitivity and baseline stabilization procedures are specified.

Sampling & Pretreatment: Follow ISO 5667‑3 for sampling, preservation and handling; filter samples if necessary. Cation exchange pretreatment is required when hardness metals are present.

Applications and Users

Routine water quality monitoring in drinking water and groundwater surveillance.

Environmental and industrial laboratories performing high‑throughput sulfate analysis.

Wastewater treatment facilities for process control and compliance testing.

Regulatory agencies and accredited testing labs needing an ISO‑aligned CFA sulfate method.

Related Standards

ISO 3696 – Water for analytical laboratory use (reagent water quality)

ISO 5667‑3 – Water sampling, preservation and handling

ISO 8466‑1 / ISO 8466‑2 – Calibration and evaluation of analytical methods

ISO 22743:2006 is a practical, automated CFA method for reliable sulfate determination in various water matrices, offering standardized procedures for reagents, instrument setup, interference control and calibration to support accurate water quality monitoring.

ISO 22743:2006

Abstract

Похожие стандарты

Overview

Key Topics and Requirements

Applications and Users

Related Standards

Технические детали

ISO 8466-1:2021

Water quality — Calibration and evaluation of analytical methods — Part 1: Linear calibration function

ISO 8466-2:2001

Water quality — Calibration and evaluation of analytical methods and estimation of performance characteristic…

ISO 5667-3:2018

Water quality — Sampling — Part 3: Preservation and handling of water samples

ISO 3696:1987

Water for analytical laboratory use — Specification and test methods